If there's a hole, it may be a red flag.b) sensitivity analysis: I examine all the assumptions, and make sure I can live with the worst case scenarios.c) "Stall and see": if they are getting money over multiple years, and there is no penalty for investing later, I would usually wait so I get some real performance data, versus having to look at theoretical pro forma information.d) Recession stress test: I will not invest in anything, until I subject it to recession level stress and see if I can live with the result.

Better drainage?

To do that I could cut a hole in the dry wall and turn it 90 degrees so people can use it from the hallway but there is a light switch for a nearby bathroom in the way so that would need to be moved into the bathroom as well.

Depending on the class of this property get rid of that sprayer too just close off the 4th hole on the sink with cover plate.  

A drywall patch, mud and repaint will cost your, say, $300 regardless (I know the size of the hole matters, but your rent doesn't).  

Controlling this moisture is 100% best done when the house is being built, so if the builder or homeowner never intended or cared that it be finished, and didn't seal the basement and provide for toe drainage, everything you do is going to be combatting that issue.

I racked my brain for a simple hack, and what I came up with was disposable aluminum roaster pan inserts that had holes punched in straight from the dollar store.

My husband and I have spent the last few months reading all the books and listening to all the podcasts, essentially going down the rabbit hole as most rookies do.

The result will be rentals are not maintained and will be come $hit hole units.  

Poke holes or message me if interested.